(The Center Square) - Citing affordability concerns, Seattle City Councilman Bob Kettle wants to cut Mayor Katie Wilson's plan to raise the Seattle sales tax by 0.15% to pay for more public transit services, such as more frequent bus service. Wilson's proposal would increase the city sales tax that funds public transit by 0.15 percentage points, to 0.3%. Kettle's amendment to the plan would increase the sales tax "by a more moderate 0.05%." Kett…